Malicious PDF — malware analysis report

Static analysis result for SHA-256 3986f5b221c6c6f2…

MALICIOUS

PDF

70.1 KB Created: 2021-09-24 20:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 29bc5c4be0b5842fe24a50744755001f SHA-1: 30115ddebdcfa2c27e334dfc339bbd6cbe62ca9f SHA-256: 3986f5b221c6c6f2540999b1550478bd1226926cf203917bb4a10b682147f0e5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with a high-confidence flag for malicious PDF content. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The embedded JavaScript likely redirects users to external URLs, as indicated by the presence of numerous URLs in the extracted evidence, some of which are associated with link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130813e7e359---78486999280.pdf In PDF document text
    • https://pmfegypt.com/userfiles/files/vaveb.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/82989429514.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/0h5va00hp4062ftg2dau3netir/19187330109.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/vemofogipot.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/55762835211.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/71948780406.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/26426036354.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/37111032448.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/42759736825.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/jiforuw.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/74066895494.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/wugiradekusuteladivub.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/99493172631.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/60953400624.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/guxifak.pdfIn PDF document text
    • http://kite-surf.sk/files/xesazetivenudeduvufox.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/65931867098.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/80812280154.pdfIn PDF document text
    • http://jonellchem.com/upload/files/gawunujovulopawagu.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/fotikazewenu.pdfIn PDF document text
    • https://siroyensao.com/upload/files/zazaxiwogeteleni.pdfIn PDF document text
    • http://i-physiology.ru/upload/sodiza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=shadow+fight+2+unlock+everythingPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E7 15228 bytes
SHA-256: 7c0d246b5e0a299dd88396e3b0eb06dc501706a762f59946f32d40194572645f
font_01_sfnt_off0000d859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD859 11240 bytes
SHA-256: fab0528d8b612c120e28dd619aa0fa47ff524d0a79699fd4304c6f7057683e41
font_02_sfnt_off0000f29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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